
Chapter 18: Analog Parameters Set Using QSF Assignments 18–5
Analog Settings for Arria V GZ Devices
November 2012 Altera Corporation Altera Transceiver PHY IP Core
User Guide
Analog Settings for Arria V GZ Devices
Table 18–3 lists the analog parameters for Arria V GZ devices whose original values
are place holders for the values that match your electrical board specification. In
Table 18–3, the default value of an analog parameter is shown in bold type. The
parameters are listed in alphabetical order.
Table 18–3. Transceiver and PLL Assignments for Arria V GZ Devices (Part 1 of 2)
QSF Assignment Name
Pin Planner and
Assignment Editor
Name
Description Options
Assign
To
XCVR_IO_PIN_TERMINATION
Transceiver I/O Pin
Termination
Specifies the intended on-chip
termination value for the specified
transceiver pin. Use External Resistor
if you intend to use off-chip
termination.
85_OHMS
100_OHMS
120_OHMS
150_OHMS
EXTERNAL_
RESISTOR
Pin -
TX & RX
serial
data
XCVR_REFCLK_PIN_
TERMINATION
Transceiver Dedicated
Refclk Pin Termination
Specifies the intended termination
value for the specified refclk pin. The
following 3 settings are available:
■ AC_COUPLING: Altera
recommends this setting for all
transceiver designs. Use it for AC
coupled signals. This setting
implements on-chip termination
and on-chip signal biasing.
■ DC_COUPLING_INTERNAL_100_OH
M: Used this setting when the
dedicated transceiver reference
clock pins are fed by a DC coupled
signal whose V
cm
meets the device
specification. This assignment
implements internal on-chip
termination but not on-chip signal
biasing.
■ DC_COUPLING_EXTERNAL_
RESISTOR: Use this assignment
when the dedicated transceiver
reference clock pins are fed by a DC
coupled signal. This option does
not implement internal on-chip
termination or signal biasing. You
must implement termination and
signal biasing outside of the FPGA.
This assignment is recommended
for compliance with the r PCI
Express Card Electromechanical
Specification Rev. 2.0 and the
HCSL IO Standard.
DC_COUPLING_
INTERNAL_100
_OHMS
DC_COUPLING_
EXTERNAL_
RESISTOR
AC_COUPLING
Pin -
PLL
refclk
XCVR_RX_BYPASS_EQ_
STAGES_234
Receiver Equalizer Stage 2,
3, 4 Bypass
Bypass continuous time equalizer
stages 2, 3, and 4 to save power. This
setting eliminates significant AC gain
on the equalizer and is appropriate for
chip-to-chip short range
communication on a PCB.
ALL_STAGES_
ENABLED
BYPASS_
STAGES
Pin -
RX serial
data
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